[W32] gnutls-2.12.18 fixes

[LRN]

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W32 support in GNUTLS 2.x deteriorated a little bit since my last
patching session. Here's a few things that require fixing:
1) gnutls-2.12.18/lib/nettle/egd.* is incompatible with W32 (uses UNIX
domain sockets, absolute UNIX-style paths, calls stat() on integer
file descriptors thought to be sockets, and uses S_IFSOCK). It should
be disabled at configure time.
2) gnutls-2.12.18/lib/nettle/rnd.c requires #include <wincrypt.h> on W32
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